:D:D:D
If it was that simple, everyone would do it.
You can not. It takes a lot of programming knowledge and that creators give you access to the source code.
VocalizerEx2 is an old, was temporary and obsolete solution.
You can try Alfanum.
However, what you need to understand is the problem in the device, that is, the implementation of the android system.
If it's crippled, impoverished, lacking in functions ... you have a lot to bother.
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